Structure of computer keyboard (II)

ABSTRACT

A computer keyboard includes two symmetrical parts, each consisted of a bottom shell supported on a common base plate above a common bottom plate, and a top shell supported on the respective bottom shell, wherein the bottom shell has inverted T-rods made to slide in respective arched slots on the base plate, a locating block made to slide in a guide groove on the base plate; the base plate has a spring stop strip terminated to a projecting potion engaged into a serrated side wall of the locating block of the bottom shell; a lifting mechanism is connected between the top and bottom shells and controlled to turn the top shell on mounting lugs on the bottom shell permitting the top shell to be moved from a horizontal position to a sloping position or from the sloping position to the horizontal position.

BACKGROUND OF THE INVENTION

The present invention relates to computer keyboards, and relates more particularly to such a computer keyboard which is consisted of two parts, each part being adjustable horizontally as well as vertically.

A variety of computers are known and widely used in different fields. As the keyboard of a normal computer system is made in a rectangular shell which does not fit the hands ergonomically, the muscles and nerves of the hands may be hurt easily after a long period of time in operation.

SUMMARY OF THE INVENTION

The present invention has been accomplished to provide a computer keyboard which eliminates the aforesaid problem. It is therefore an object of the present invention to provide a computer keyboard which is comprised of two symmetrical parts that can be respectively tilted in reversed directions to fit over the hands for a comfortable operation. It is another object of the present invention to provide a computer keyboard which is comprised of two symmetrical parts that can be respectively adjusted horizontally to fit over the hands ergonomically for a comfortable operation.

According to the preferred embodiment of the present invention, the computer keyboard comprises two symmetrical parts, each consisted of a bottom shell supported on a common base plate above a common bottom plate, and a top shell supported on the respective bottom shell, wherein the bottom shell has inverted T-rods made to slide in respective arched slots on the base plate, a locating block made to slide in a guide groove on the base plate; the base plate has a spring stop strip terminated to a projecting potion engaged into a serrated side wall of the locating block of the bottom shell; a lifting mechanism is connected between the top and bottom shells and controlled to turn the top shell on mounting lugs on the bottom shell permitting the top shell to be moved from a horizontal position to a sloping position or from the sloping position to the horizontal position.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of a computer keyboard according to the preferred embodiment of the present invention;

FIG. 2 shows the keyboard of FIG. 1 adjusted horizontally;

FIG. 3 a side plain view of the computer keyboard of FIG. 1 showing the top shell lifted from the bottom shell;

FIG. 4 shows the connection between the lever and the push knob;

FIG. 5 shows the projecting portion of the spring stop strip engages into the serrated side wall of the arched locating block of the bottom shell;

FIG. 6 is an elevational view of the computer keyboard of the present invention showing the upper shell turned to a sloping position on the bottom shell; and

FIG. 7 is another elevational view of the computer keyboard of the present invention showing the top and bottom shells adjusted horizontally.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

A computer keyboard in accordance with the present invention comprises two symmetrical parts (See FIG. 2). As the two symmetrical parts are similar, only one part of the computer keyboard is described in detail.

Referring to FIG. 1, the present invention comprises a bottom plate 8, a base plate 7 fastened to the bottom plate 8 at the top, a bottom shell 6 made to slide on the base plate 7 horizontally, and a top shell 1 supported on the bottom shell 6. The base plate comprises a plurality of arched slots 71;72;73 of different curvature, of which each having one end terminated to an expanded hole 711;721;731, an arched guide groove 75 spaced between two arched slots 71;72, a spring stop strip 751 disposed along one side of the guide groove 75 and having a projecting portion 751 at one end, and a plurality of internally threaded bottom stub rods 74 spaced around the border of the bottom wall thereof. The bottom plate 8 comprises a plurality of hollow stub rods 82 respectively connected to the internally threaded bottom stub rods 74 of the base plate 7 by screws 9, and a plurality of locating blocks 81 raised from the top surface thereof and respectively fitted into the expanded holes 711;721;731 of the arched slots 71;72;73. The bottom shell 6 comprises a plurality of inverted T-rods 64 respectively inserted into the expanded holes 711;721;731 of the arched slots 71;72;73 (before the installation of the locating blocks 81 of the bottom plate 8) and then moved sideways to slide in the arched slots 71;72;73, an arched locating block 66 corresponding to the arched guide groove 75, which has a serrated side wall into which the projecting portion 7510 of the spring stop strip 751 engages (see FIG. 5), a recessed portion 61, which comprises two parallel slide grooves 611 at two opposite sides, a first arched slot 62, which comprises a front end hole 621 and a rear end hole 622 respectively turned sideways from two opposite ends thereof, two opposite mounting lugs 63 raised from the top surface thereof and spaced at one side, a second arched slot 65 spaced between the first arched slot 62 and the recessed portion 61 and having one end terminated to an expanded hole 650. There is provided a T-bar 3 comprising a transverse section 31 made to slide between the slide grooves 610 on the recessed portion 61 of the bottom shell 6, and a longitudinal section having a pin hole 312 connected to a link 40. The transverse section 31 has pivot holes 311 raised from two opposite ends thereof to which a substantially U-shaped lifting rod 2 is pivoted. The U-shaped lifting rod 2 comprises two first pivots 22 longitudinally aligned in the middle at two opposite sides and respectively inserted into the pivot holes 311 on the transverse section 31 of the T-bar 3, and two second pivots 21 at two opposite ends thereof respectively inserted into respective pivot holes 12 on the top shell 1. The link 40 comprises a pin 401 at one end inserted into the pin hole 312 on the longitudinal section of the T-bar 3. The opposite end of the link 40 is coupled to a lever 4. The lever 4 has a front end pivoted to the link 40 and a rear end terminated to two opposite hooks 42 spaced by a longitudinal opening 41. The lever 4 further comprises a bottom rod 43 inserted through the expanded hole 650 and then moved into the second arched slot 65 on the bottom shell 6, and therefore the rear end of the lever 4 can be alternatively moved back and forth along the second arched slot 65 (see FIG. 4). There is provided a push knob 5 having a hollow head 50 connected to the hooks 42 of the lever 4, and a unitary push rod 51 perpendicularly extended from the hollow head 50 and inserted into the longitudinal opening 41 on the lever 4. The push rod 51 of the push knob 5 terminates to a bottom rod 52 at right angles made to slide in the first arched slot 61 on the bottom shell 6 (See FIG. 4). The hooks 42 of the lever 4 are respectively inserted into a hole (not shown) on the hollow head 50 of the push knob 5 and retained connected to the hollow head 50 of the push knob 5 by spring elements 53 (see FIG. 4). The top shell 1 comprises two opposite mounting lugs 13 spaced on the bottom wall thereof at one side and respectively pivoted to the mounting lugs 63 of the bottom shell 6, and pivot holes 12 spaced on the bottom wall, which receive the second pivots 21 of the U-shaped lifting rod 2 respectively, a key switch mounting area 10, which receives a key switch assembly, and a zig-zag side matching portion 11 fitting over the corresponding zig-zag side matching portion on the opposite part of the computer keyboard (see FIG. 2).

Referring to FIGS. 2, 3, 4, 5, and 6, by means of sliding the inverted T-rods 64 in the arched slots 71;72;73, the top and bottom shells 1;6 can be moved on the base plate 7 horizontally (see FIGS. 2 and 7). As the bottom shell 6 is moved horizontally on the base plate 7, the projecting portion 7510 of the spring stop plate 751 passes over the serrated side wall of the arched locating block 66 of the bottom shell 6. Each time the projecting portion 7510 of the spring stop plate 751 is moved from one pitch between either two teeth of the serrated side wall of the arched locating block 66 to another, a click sound is produced. Further, the spring elements 53 give an outward pressure to the hollow head 50 of the push knob, causing the bottom rod 52 of the push rod 51 of the push knob 5 constantly retained in the rear end hole 622 of the first arched slot 62. When the hollow head 50 of the push knob 5 is pushed inwards to release the bottom rod 52 of the push rod 51 from the rear end hole 622, the lever 4 can then by moved by the push knob 5. As the bottom rod 52 of the push rod 51 of the push knob 5 is moved from the rear end hole 622 to the front end hole 621 (see FIGS. 3 and 4), the link 40 is simultaneously driven by the lever 4 to pull the T-bar 3 outwards, causing the U-shaped lifting rod 2 turned on the transverse section 31 of the T-bar 3, and therefore the top shell 1 is lifted from the bottom shell 6 and turned about the mounting lugs 63 on the bottom shell 6 (see FIG. 3 and 6). Therefore, the top shell 1 can be tilted on the bottom shell 6.

As indicated, by means of sliding the T-rods 64 in the arched slots 71;72;73, the top and bottom shells 1;6 can be adjusted horizontally on the base plate 7; by means of the engagement between the projecting portion 7510 of the spring strop strip 751 and the serrated side wall of the locating block 66, the top and bottom shell 1;6 can be retained in position on the base plate 7 horizontally; by means of the control of the push knob 5, the top shell 1 can be adjusted to a desired sloping position above the bottom shell 6. 

What is claimed is:
 1. A computer keyboard comprising a bottom plate, a base plate affixed to said bottom plate at the top, a bottom shell supported on said base plate, and a top shell supported on said bottom shell to hold a set of key switches, wherein said base plate comprises a plurality of arched slots, each arched slot having one end terminated to an expanded hole, an arched guide groove, and a spring stop plate having one end terminated to a projecting portion; said bottom shell comprises two opposite mounting lugs spaced at one lateral outer side thereof pivoted to respective mounting lugs on said top shell for permitting said top shell to be turned above the mounting lugs on said bottom shell, a plurality of inverted T-rods made to slide in the arched slots on said base plate, and an arched locating block having a serrated side wall engaged with the projection portion of said spring stop plate; moving said top shell horizontally causes said inverted T-rods of said bottom shell to slide in the arched slots on said base plate, and therefore the horizontal position of said top and bottom shells relative to said base plate is changed.
 2. The computer keyboard of claim 1 wherein each arched slot of said base plate has one end terminated to an expanded hole through which either inverted T-rod of said bottom shell is inserted into the respective plurality of arched slots.
 3. The computer keyboard of claim 2 wherein said bottom plate comprises a plurality of blocks raised from a top surface thereof respectively fitted into the expanded hole on either arched slot of said bottom shell. 